AC-Calorimetry at High Pressure an Low Temperature
AC-Calorimetry at High Pressure an Low Temperature
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高压低温交流量热法
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Wilhelm
中科院分区：
文献类型：
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作者：
H. Wilhelm
讨论了适应高压实验需要的交流量热技术的最新进展。在0.1K~1.5K温度范围内，用布里奇曼型压力室和金刚石顶压室半定量测量比热是可能的，固体He的截止频率比滑石高得多。实验表明，在1K以下和10 Gpa以上的压力下，可以测量比热的线性温度系数的压力依赖关系。这与同一样品的电阻率测量几乎同时获得的相关量是定性一致的。
Recent developments of the AC-calorimetric technique adapted for the needs of high pressure experiments are discussed. A semi-quantitative measurement of the specific heat with a Bridgman-type of pressure cell as well as a diamond anvil cell is possible in the temperature range 0.1 K 1.5 K reveal for solid He a cut-off frequency which is considerably higher than for steatite. Experiments below 1 K and pressures above 10 GPa clearly show that the pressure dependence of the linear temperature coefficient of the specific heat can be measured. It is in qualitative agreement to a related quantity obtained quasi-simultaneously by electrical resistivity measurements on the same sample.